Jakiej funkcji użyć by wynik nie był uzależniony od kolejności if()
If-y
if (context.Input.Length == 0)
return;
else
{
if (context.Input.StartsWith(Nine()))
{
context.Output += 9 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
else if (context.Input.StartsWith(Five()))
{
context.Output += 5 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
else if (context.Input.StartsWith(Four()))
{
context.Output += 4 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
int i = context.Input.Length;
while (i != 0)
{
if (context.Input.StartsWith(One()))
{
context.Output += 1 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
i--;
}
}
Cały Kod
using System;
using System.Collections.Generic;
namespace Interpreter
{
class Context
{
private string input;
private int output;
public Context(string input)
{
this.input = input;
}
public string Input
{
get { return input; }
set { input = value; }
}
public int Output
{
get { return output; }
set { output = value; }
}
}
abstract class Phrase
{
public void Interpreter(Context context)
{
if (context.Input.Length == 0)
return;
else
{
if (context.Input.StartsWith(Nine()))
{
context.Output += 9 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
else if (context.Input.StartsWith(Five()))
{
context.Output += 5 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
else if (context.Input.StartsWith(Four()))
{
context.Output += 4 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
int i = context.Input.Length;
while (i != 0)
{
if (context.Input.StartsWith(One()))
{
context.Output += 1 * Multiplier();
context.Input = context.Input.Remove(0, 1);
}
i--;
}
}
/* UZUPEŁNIĆ kilka else a może while? */
}
public abstract string One();
//
public abstract string Four();
public abstract string Five();
public abstract string Nine();
public abstract int Multiplier();
}
class PhraseThousands : Phrase
{
public override string One() { return "M"; }
public override string Four() { return " "; }
public override string Five() { return " "; }
public override string Nine() { return " "; }
public override int Multiplier() { return 1000; }
}
//
//
//
//
class PhraseHundreds : Phrase
{
public override string One() { return "C"; }
public override string Four() { return "CD"; }
public override string Five() { return "D"; }
public override string Nine() { return "CM"; }
public override int Multiplier() { return 100; }
}
class PhraseTens : Phrase
{
public override string One() { return "X"; }
public override string Four() { return "XL"; }
public override string Five() { return "L"; }
public override string Nine() { return "XC"; }
public override int Multiplier() { return 10; }
}
class PhraseNumbers : Phrase
{
public override string One() { return "I"; }
public override string Four() { return "IV"; }
public override string Five() { return "V"; }
public override string Nine() { return "IX"; }
public override int Multiplier() { return 1; }
}
class Program
{
static void Main()
{
List<Phrase> tree = new List<Phrase>();
tree.Add(new PhraseThousands());
tree.Add(new PhraseHundreds());
tree.Add(new PhraseTens());
tree.Add(new PhraseNumbers());
//
string roman = "MDXLIII";
//
Context context = new Context(roman);
foreach (Phrase item in tree)
{
item.Interpreter(context);
}
Console.WriteLine(roman + " = " + context.Output);
// MDXLIII = 1543
roman = "CMXVII";
context = new Context(roman);
foreach (Phrase item in tree)
{
item.Interpreter(context);
}
Console.WriteLine(roman + " = " + context.Output);
//
//
// CMXVII = 917
}
}
}
